I fully agree that 3.5 days post age limit (GrumpyCompliance) or less would be much better (and other vote-sellers have already implemented it), as it would give the community better possibilities to find and evaluate posts upvoted by @minnowbooster (and all those other shady accounts like @peaceandlove whose votes they are selling). The 5 day limit can be a first step to mitigate the worst cases of abuse (and I heard they want to implement some further measures), but I think this service still deserves some @grumpycat attention. For post promotion 1 (or maybe 2) days would be sufficient. In many cases votes are bought purely for profit and not to promote the post.