800 zen converts to roughly 130,000 dilithium at current market prices.
130,000 dilithium can be used to immediately finish 7.2 research projects.
Assuming none crit for the 1,000 bonus.. that's still 43,200 research points.
This boost, like all of the others, is hilariously useless. If it cost 1/4 as much it still wouldn't be cost effective to buy, especially considering you still have to complete a ton of research to see any benefit from it. Truth be told these things should cost 1/6 to 1/10 as much if you want to make them even remotely worth briefly considering.
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But yes, buying one with zen seems foolish.