it sounds like you want to, but looking for us for some reassurance
do what you want to and don't rely on what everyone here says. there is still money in TGPs (as long as you know what you are doing), but not like the money from 5 years ago.
honestly, i think the correct answer to this or any "should I start a ___ site?" is as long as you have experience and know what your doing then go for it. If you don't know what your doing or ever ran a TGP site, then id look at this of more a hobby