My main concern was that someone with more money than me could come along, start using it, trademark it, and make it unusable for me. I've been thinking about trying to trademark it, but it's expensive and complicated, especially if I can't get a trademark personally and transfer it to a business in the future
In the meantime I decided it was worth the money to buy every decent TLD as a way of discouraging someone else from trying to use the same name. It's not cheap, but it's cheap in the context of what people like the OP pay for a decent .com.
I pay about $200 / year in total to renew about a dozen matching domains. I can hold onto those for 20 years and it'll still cost less than the asking price of a half decent .com.
Think of the .net and .org as a $3 month expense for brand protection. I'm from Canada where .com and .ca are used pretty equally. I remember about 10 years ago when a local computer store only registered one of them and ended up with an unhappy customer redirecting the other to a porn site. Would you pay $3 / month to avoid dealing with that?