Twitter and telegram is really a good source of new memes on crypto but its too hard to trust memes this days be very careful theres a lot of honeypot memes on crypto If you are a meme hunter then you what it means. I find new memes on SOLANA chains almost every hour but too risky to buy them incase you cant sell or devs dump on your face. I just continue to accumulate well known memes like shib and bonk rather than buy new ones and crash later.
I also often encounter this. but they don't buy in large quantities, maybe less than $5. They hope that the price of the meme coin they bought will rise drastically because currently the meme coin on the Solana network is hype. It doesn't matter because it's their right, they are the same as playing gambling because the chance of losing money is much greater than the chance of winning 
They are hoping that once the hype comes in they are the first that will going to exit and earn decently, just like what you said same deal with gambling hoping for luck to arrive then take advantage on it, I think there are people who are willing to take that kind of gamble with a high hope that one of this days he will manage to pick that lucky meme project that will give him huge amount of profits.
Who knows with your $5 investment it will pump to something that you never imagine, inside crypto, there are numerous times that it happened.
Even how good is your research meme project is intended to create pump then dump after, timing and good management of risk is neeed when you place your investment in this kind of project, better to take your money as it is already taken away from you, not to expect anything but for luck to back you up and give you that huge outcome to grow your initial capital.
No assurance and a huge amount of risk each time you play around with meme assets, and if you are not willing to submit yourself in this kind of investment, better to allocate your money with other projects that are already have good reputation and have a long and lasting direction.