Your bias is showing.
In many parts of the world, the majority of people don't need to use tax software or "do their taxes". For example, here in the UK many basic taxes are deducted at source and then reported and paid by the employer/merchant/bank, so many people never have to file a return at all. Those who do typically use an on-line system provided by the tax authority or work with a professional accountant who can then file on their behalf. None of these people needs to run the kind of tax software you mentioned on their own computer.
In the US, you are not required to file taxes period unless you owe money. The government is more than happy to keep any extra that may have been submitted via employers/etc on your behalf. Also, you can typically pick up the forms at a local post office.
So no, there is no requirement to use a computer to do your taxes in the US. It's just that there is a very large majority that is a lot larger than the U.S gaming market that do use software or on-line services to do their taxes. I wouldn't be surprised if it was similar elsewhere too.
Now it doesn't help that Intuit and others mail out copies of their software anticipating people will use it; it comes with some free access (typically Federal taxes) and then some paid access (typically States support). Nor does it help that the software is basically free even if you do pay for it as you can add the cost of paying someone to your taxes as a deduction.
Also, your stereotypes about gamers are way out of date. For example, the ESA's 2014 report suggests that interest in entertainment software is roughly equal between the sexes.
That doesn't change the reality that those using software to do their taxes are still a larger group than those playing games on their computers. However, you'll probably also need to look at the difference in there between (a) computer vs console games, and (b) whether there is a significant difference in the genders for those who will build specialized systems for their computer gaming. My guess is that the results of both will show a skew in computer gaming towards the males.