Remove the 15 second timer asking you to turn off ad-block
offensively inconvenient to have a window pop up and ask you to stop blocking ads with a 15 second timer now and suggest to purchase an ad-free service - you're advertising a cash service to block ads to users who've already gone out of their way to block ads free and legally, use common sense or do more market research.
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Odette Forth commented
In my experience, the only "messages" that my ad-blockers have ever "hidden" in my in-box have been "messages" that are simply advertisements inserted by Yahoo, not actual email messages that have been sent to me.
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Odette Forth commented
Ad-blockers lead to performance problems for whom? For Yahoo or for the end users? I average about one email message per day -- a few milliseconds performance difference at my end is not noticeable. If the problem is at Yahoo end, then the obvious solution is for Yahoo to not insert ads.