I guess you've never experienced moving your funds (in BTC) yet. You'll understand the importance of it once you realized you no longer need intermediaries that can hold/lock your funds.
This is why I would like to know your reply if it is alright to earn profit with bitcoin coming from the new investors of bitcoin? The existing bitcoin holders bought bitcoin cheaper than the new investors that they can get bitcoin at higher price as of the moment.
You are labeling bitcoin as some ponzi scheme here but that's not the case. There is no need for you to go on guilt trip. Bitcoin price depends upon much more factors than just the time of purchase.
Allow me to supplement this using a traditional business scenario @KingsGambet19
Let's say you decided to become an online retailer. You'll to get in contact with a supplier of that product and buy from them. If he sold that to you at $5 per piece, you'll need to double or triple that price to cover the cost and earn something. Now my question is, would retailers like you feel guilty of profiting from your customers too?
Another thing, there is real value in bitcoin. Don't think of it as money made out of thin air that you'd feel guilty when you trade it.