There are a lot of robots. Some very different from each other. Let's see for example:
Bender: I would buy beer, cigarettes and spend a few thousand on girls jajajaj 
Robocop: well I should buy better armor and update the software hahahaha
R2D2: this robot would definitely buy better hardware, to run better and not just speak thousands of languages hahaha
wall-e: you're fascinated by Barbra Streisand's films. Between movies and gifts for her "friend" Eva her money would be spent.
Optimus: I would spend all your money getting ultron plans to avoid having to go to war.