At first I was not too sure if your original post was serious. But it looks like you are being serious.
Instead of focusing on the exact question "Does selling vol make lots of money"? I think it will be more insightful to talk about strategy. Note there are also countless papers on the returns of selling variance that will explain it much better than i can(spoiler alert there is no silver bullet) .
Whenever you think a strategy will make large returns on capital - in this case "hundreds of percents a year" - it will have to meet at least 1 of 2 criteria: 1) Hard to take advantage of 2) Low capacity.
1) Hard to take advantage of: This could be caused by rules and regulations, large transaction costs to trade in the market, high upfront cost to start the business (infrastructure), etc..
2)Low Capacity: Once you reach a certain size it is hard to trade without moving the market. These strategies are usually left alone by larger players.
Anyone with a brokerage account can sell options and there is lots of capacity especially on large names/indexes. So right off the bat this strategy is not going to make hundreds of %'s a year, not even close. Never forget you are trading in a market place - People who do not have good strategies will become smaller and people who have good strategies will become larger. Eventually the sellers will have grown so big (because they are making 100's of %'s) that the supply will outweigh the shrinking pool of option buyers(losing players).
But as Aaron Brown would say - "take the bet!" Bet big enough that it means something and you learn from it but not too big that it causes you hardship.
Yeah buy option buyers win too. They might not win often but when they do win, they win a windfall. They basically become the steamroller and win back all of the money that they've been losing to the option sellers. LOL
