The mechanic's footprint in a typical lobby is larger than most players realise. Among new releases from the major studios, a clear majority now ship with a purchase option, and the most-played lists on many sites are dominated by titles in this category even though they represent a minority of the total catalogue. By that measure bonus buy slots have moved from a niche to the commercial core of online slot play within a few years. Older games without the button persist in the library but attract a shrinking share.