~snip~
Hmm, I guess you will be happy... for around 15 seconds. After that, it's pretty much normal from there. You will be happy that you won several dollars, but after that, you will think of the next. Either you will stop, or you will use that winnings again to win more dollars.
As somebody that only gambles $10 per week, winning $50 is already a big thing for me, but to a point where I'm incredibly happy because at the back of my head, I will still think of the losses that I had in the past and will say "This isn't enough to cover all of my losses." It will be a different reaction if it's a million dollars though. At the end of the day, it will depend on your lifestyle, and maybe the country where you're living. For us, $50 can buy many things already, but in other countries $50 isn't enough for a family to cover a single breakfast, dinner or lunch.
If you win, you will feel the adrenaline rushing on your body hence, you will find more profits which will lead to losses in the end. I know this isn't happening to all gamblers, but it's happening.

I am happy with any win, and the intensity of my emotions depends mainly on the size of the bet. If I bet $1 and won $50, I would be very happy. If my bet was $5, I would also be happy, but not as much. In my opinion, the joy of winning also depends on experience. I remember when I won $10 for the first time, I was ecstatic. Now, when I win $100, I can't experience the same emotions because I have had much bigger wins in my experience. In addition, I think that over time we get used to dopamine surges and they no longer affect us as much. Partly because of this, many gamblers, having increased their bankroll by 20-30%, continue to gamble instead of withdrawing their money.
In gambling win $50 may not be worth much to those who have used big bets to win, but to those who bet low, $50 is a big win. So how much a gambler will be happy with a win will depend on his or her own gambling style. There are even some for whom a $20 win means a lot. I used to enjoy small wins. But when I win big and bet more with that winning money, I no longer find that joy in small wins as you mentioned here. But when I don't have enough money to bet, that money gives me the same joy as a big win.
Winning amount would be that always reflect out on how much you had put on as your base bet on which if the amount is big then 50 bucks isnt something that you would be needing to celebrate on, but if you are a gambler who do put up some base bet or minimum and been able to multiple it to 50 bucks then it would that surely make you happy specially into those pleb gamblers who do only have that sufficient amount for them to play on. It doesnt matter on what amount that we are talking on here, the most important stuff on here is that you should be having that fun and entertainment despite on what amount that you've been that spending on. There are just that those individuals who do live into those countries on which 50 bucks isnt something that significant but if you are living into those countries on which does have that on that 3rd world or developing countries then this amount would be already that significant and just that like been said that it will be that up to you on how you would enjoy things up accordingly and not all will be having that mentality when it comes into this aspect.
The most important thing on here is that you do know on when you should be taken out that profits or winning at the time that it do happen. The most common mistake of people or gamblers is that they do become that boosted up on why they would be that continuing on doing just because they've been that becoming optimistic that they do make that money on their next rolls and thats why we do end up on having that very common scenario on which we are that losing in the end. We do know that on the time that you do win up some money on doing gambling. Amount that could make you happy is something which is more than on what you have been able to hit up in the past. If it turned out to be that more than into that level then its normal that you do become happy and when that happens then you would be that becoming optimistic that you can play up even more and made out those decisions that you should be that playing more. Its not bad to gamble as long you do know on when to get out or secure your profits. Never ever that be considerate about on taking up actions that you would be finding yourself having that potential problem later on. Its impossible that you cant be able to determine on whats wrong or right.