Reducing research cost by 40% or improve church/tavern range by 100%
Surely you can see why this is silly right?
Once your research is done, it provides no benefit and is wasted.
The church/tavern upgrade stays forever and will drastically increase your monetary gain overal, overshadowing the cost of research for sure.
picking between a " buff til X vs buff forever " is fine, if the conditional buff is really over compensated for it being temporary.