I have well over 100 listed on just one of my portals and that is because there our some casinos I would not whish on anyone. As well the more you have listed the more time you will in the end re editing your list as some are just totally crap or turn to crap as time passes ….
Good luck with a huge list I found that even a 100+ is pushing luck and there are few poorly converters that I put at the bottom of my list as basic way to flip them the bird for being arse holes
The more you add to your list the bigger migraine you are gauranteed to have.