For the challenge:

The challenge of living within your means when you start out then realising that no company gives the payrises and/or bonuses stipulated as possible in the contract or 'a sure thing' by the recruiter, such that what was comfortably your living within your means becomes living well outside your means thanks to inflation, and no pay review to make things match.

OR

Because I like to do work that either never gets used, or gets rewritten and fucked by the apprentice before anyone attempts to use it.