Most Turkish guys are Muslim, very family orientated and their families like them to marry Turkish women and have families. They see Western women on the whole as 'toys/with loose morals' - so therefore easy to have a fling with or to get them to buy them things.
This.
I've encountered this in many other countries too.
If they don't need a visa or money, they'll just try to use you for sex.
If they need a visa, they'll try to use you for sex and a visa.
If they need money, they'll try to use you for sex and money.
If they need both, you'll getvtriple whammied.
By the way, if they can't marry you for the visa because eg they're already married somewhere that had a good registry system (not Turkey, you might not be able to find out if they're married), they'll even try to get you to have a child with them, because that used to get a "right to remain" til the child was at least 18. Not sure if it does anymore.
It wasn't even about age or looks; I was an early 20s pretty attractive young woman when I experienced this.