I don't think that's a good idea. Seeing you have some cash on hand is a signal that you are more well-of and they might be more incentivized than they were pre

I don't think that's a good idea. Seeing you have some cash on hand is a signal that you are more well-of and they might be more incentivized than they were previously to take your bag/wallet/etc. Basically there's no incentive for them to stop at just taking that extra cash when they can take that and whatever else they were planning to.