I usually play 35$ tournaments (Starting 200,000 chips) at a local card room and they offer a 30$ add on that gives you 200,000 chips at the 5,000/10,000 blinds and 1,000 ante level. Is it worth it to add on? Does it depend on your stack size/ other players? Generally about half the people end up doing the add on if that matters.
I think your chip count is the most important factor. If you are the chip leader at your table even after the add ons of other players then the additional chips are worth far less to you. However if you are at average stack or short stacked I think it’s a 100% yes to the add on.