That's a very good point! I can't say I've ever roasted my own coffee, so it's something I've not experienced in person. I hear you can buy green beans and roast them with a popcorn machine though, which sounds kinda fun to try.
It is very fun, and way tastier:
https://www.sweetmarias.com/category/green-coffee/others/sam...
To make this a bit more on-topic for HN: http://www.cigarasylum.com/vb/showthread.php?t=45932
The above describes creating a bread-machine "Coretto" roaster. (I still have no idea why it's named that). A heat gun (for paint drying) from Harbor Freight (~$15, it's almost always on sale) is used for the heat. The bread machine is torn apart so it permanently spins, and never turns on the heating element.
After using it manually a bit you'll get the bug too. Eventually you'll want to control it electronically. I still have to actually do it...
[0] https://en.wikipedia.org/wiki/Coffee_roasting#Roasts