the bomb banks spy op should be seen as a way to force cash stockers to engage in market actiivty to hide their cash stockpile

if cash stockers become concerned that significant amounts of their cash is at risk they will have to spend that cash to hide it from spies

as it is now, cash stockers just leave their stash unprotected and do not worry about a piddling $6M loss here or there

a classic example in express last set was torpedo who had $1.7B and no spies. he just let people bomb banks until he was in spy DR after 20 ops and his zero spies were defeating players who had SPALs in excess of 1000. he ended up losing a paltry sum and did not have to engage in economic activity to protect his stockpile
there are at least five primary players now carrying cash stockpiles in excess of $1.5B who do not care about small amounts of cash leaving their vaults

if bomb banks were a legitimate threat then these cash stockpiles would have to be spent so they could not be stolen

the current yield is 0.4% so the loss to a large stock of cash is never more than about $7M


compare that to smaller primary stockpiles of

tech which can yield over $12M an op
food which can yield over $15M an op
oil which can yield over $20M an op

if you bump bomb banks up to 1.0% yield per op then that will spur economic activity which is good for the entire site and consistent with the yields from the similarly situated stockpiles

you should also consider weakening spy DR
to offset the weakened spy DR you could impose a max number of ops per country on another country
i.e. A can only spy on B 25 times in a 24 hour period

thanks again for your efforts and consideration