I've been going back to the shops to invest money (the ones around the assassins lair) and each time I'm only allowed to invest around 5000. I can't decide how much I invest, which I find massively annoying.

The 'global investment option' says I need to invest 1,000,000 to get a shrunken head (which as we all know, are so scarce it's practically a joke.

So what they're saying, is I have to go back to the shop 200 times until I can buy one? Bit harsh isn't it?

Why can't I decide how much money to invest, instead of the game choosing for me?

This is a pain, and frustrating.