Well, he said it in a silly fashion - but realistically even on a drastically fixed budget (His is about $700 a month from his quotes - in line with the SSDI minimums of $730 for 2013 [$738 next year I think?]) if you prioritize gaming it's trivial to afford.
Hell, I was paying almost half that for my bowling league out of my own allowance as a kid because I loved bowling back then because that $25/wk adds up over the year. (Note: We're talking 25 years ago and I adjusted for inflation as a result, it was $15/wk back then)
And in Sean's case he buys almost everything he has interest in Day 1 - I probably spend about half that and have a similarly long list as him because of PS+ titles and having a shorter "Day 1" list than him getting many titles 2-3 months down the line once they get their first price drops.
Gaming is absolutely affordable if you prioritize it and are smart enough to budget it appropriate to the level of priority you want to give it. Unless you're literally in a position that's completely financially untenable. If you CAN'T afford $2500/yr in gaming IF YOU WANTED TO PRIORITIZE IT ($200/mo roughly) I'd reevaluate your income versus expenses because there's something wrong if you can't spend that little on something you enjoy each month.
It's easy to bleed yourself on stupid spending - saw something during a show that said 60% of grocery items purchased in the US actually get wasted for example - I know I'm nowhere near that we're close to 5-10% waste (mostly breads) here - if we did waste that much it would be like $150/mo thrown away each month and would inflate our food budget from $300/mo for the wife and I (although we almost always come a smidge over we're suckers for good steak (ribeyes being the fave during non-ulcer times) being a 2-3 times a week thing) up to $450/mo.
But anyhow, to end the tangent - if you don't think you can and YOU WANT TO - work on a budget and stick to it, I'm sure it's possible barring bizarre circumstances that you should fix if so.