The short answer is no, and in many cases the opposite. Studios publish the return of the purchased mode separately, and across the major catalogues that figure sits level with or slightly above the base game's, typically by a few tenths of a percent. People who ask do bonus buy slots have lower rtp are usually reacting to a run of losing purchases, which the mathematics fully expects, rather than to any published number. The relevant figures are printed in the rules screen of every certified title.