Is it Profitable to run a GMOD Server?

It depends on what you mean by worth. Economically, very difficult, even if some people manage to make a lot of money. On the other hand, in terms of fulfillment I find it very rewarding (coding, community management, ..).

merhaba sizler cok iyisiniz tanr arpsn ki seviyorum sizi

Frankly it's quite tedious, I'd much rather be a simple player if the server is properly maintained.