One thing people overlook is that the RTP for the bought feature is often different from the base game RTP. Some providers list both figures in the paytable, others bury it or do not show it at all. There is a sortable table of buy feature RTP values by provider at https://thebonusbuyslots.com that I use when comparing titles. In a few games the buy option actually returns slightly more than base play, but in others it is lower, so it pays to check.
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