I have worked at the big 4 (MS) but I'm a consultant now. I do a fair bit of interviewing and what I propose is that you don't actually have a clue what the finances of your interviewers are like, and you don't actually have a clue what the finances of your competitors are like. You would be far better served putting it out of your mind and focus on just trying to be a good engineer (presuming that's what you are trying to be) and enjoying it.
The reason being is that, not only are you almost certainly wrong, but it doesn't matter. Interviewers don't care about how much money the candidates have because...
1. they get a perk if you get hired and retained regardless, so they're incentivized to place anyone that can do the job
2. the competition often doesn't exist: the big 4 will often just hire anyone and everyone who fit their criteria (high turnover and need leads to a few hundred engineers starting each week)
3. the job has a pay band, and if you're currently making low or nil, then you're far more likely to HAPPILY fit into the lower segment of the band
BTW: The other interviewers and I can tell when the candidate is crusty and/or resentful during the interview, and it reflects negatively on their performance.