Yes, why do I like to read? Why do I like to cook (already 30 years+)? Why do I like digital electronics and microprocessors?
Brewing seems to be something that interested me because I like to cook. But it is due to a visit at Struise Brouwers that somehow my nickel fell, oh, it is possible to brew at home? Because they give every Saturday afternoon a course on brewing. I think that was in 2009.
Mind you, it still was not until 2016 that I started, because for me the figures did not add up. What, always brewing 20 l? When will I drink all that, and I like to make much different brews. In 2016 the Dutch chain Hema offered a brewing kit from the Brooklyn Brewshop, for only 4l. However, due to circumstances I ended up with another kit, which was LME based (3 l). At least I got a start in fermenting. Then starting reading, and finding out what brewing is all about. In order to go to all-grain brewing, I needed a mill. Well, look at my avatar. That coffee/spice grinder belonged to my great-grandfather who was a grocer. My parents have it in their possession. Well, with that, kitchen utensils, a cheap IKEA thermometer and the rests of the kit I started all-grain brewing. I upgraded to a real malt mill, bought a pH meter, and a 17-l kettle, but most of the time I try to improvise and get things on the cheap. I have built a bigger filter using two food-grade plastic buckets which I recuperated from the local fries shop.
So, why do I do it? It is a combination of things: crafting something for oneself, trying to do things on the cheap (but buying something when it is really needed), streamlining processes (I am a software engineer, but I also worked in factory automation), I have built my own software (still a spreadsheet really) for creating my recipes. I think it is also a way of being busy with something physically as opposed to writing software.
And other people are impressed when you mention that you brew, and are impressed by good fresh beer.