First and foremost, I'm not going to discuss my personal finances on the internet. I'm sure at some point someone has explained that it's rude to ask people what they make as its noyb. However, I will base it on a national average income based on end 2011 numbers (2012 numbers aren't readily available and 2013 can't even start to be calculated until January) of $51,413 gross household income (median household income is less than $50k and encompasses 82% of all Americans).
You don't pay $20 and get to play for the year. Most families is more like $40-100 per event. So say an average of $70. For 8 events that's $560, or a little over 1% of gross household income. Add the $3,500 in annual travel expenses, the $1080 in pack costs, the $1,000 in singles costs, and the $200 give or take in supplies (dice, sleeves, boxes, etc.) for a grand total of $6,340 (which doesn't include traveling to worlds if you're good/lucky enough to go).
Now, from that $51,413 you gotta take 15% in taxes (income, real estate, local, state, sales, obamacare, etc.). So the usable income from that would be $43,701. So, now were at near 1.25% of annual net income just for tournament entry fees, or 14.5% for total Pokemon costs! Still don't think that's too much? Well, from that $43,701 other things have to be paid first.
Mortgage/rent $12,000
Electric costs $2,000
Insurance costs $2,700
Vehicle finance $7,800
Internet costs $600
Savings/retirement $3,000
Phone costs $1,800
Other utilities $720
Food $4,800
Clothing $800
So, $36,220 comes out first leaving a disposable income of $7,481. $560 in tournament fees are 7.5% of that. Total Pokemon costs to hope to be competitive come to 84.75% of that. That leaves $1,141 in annual, $95 monthly, disposable income post Pokemon expenses, which isn't even enough to buy the gas to get to work and school not to mention the unexpected a like new tires ($400+), your A/C goes out ($2,500), medical expenses (the sky is the limit here), etc.
Taking all that into consideration, that $560 is huge. If Pokemon is the ONLY thing you do for entertainment, it can be workable by selling your higher end extras to put some money back into the kitty without the tournament entry fees. With those fees, it breaks the budget.