Can I ask why not? I don't know which country you are based in, but the majority of ISPs the world over keep tabs on what their customers are doing, which sites they are visiting, etc. Using a VPN which isn't linked to your real identity in any way (and therefore paid for in thoroughly anonymized bitcoin) is a good way to prevent this if you don't want to use Tor.
I was both a TOR user and a VPN user a few years back. In the country where I live in currently, there aren't much exposure towards bitcoin and I could say around 75% of the citizens residing over here aren't aware of the term digital currency or bitcoin. But truly speaking this isn't the only reason why I don't use VPN. I download and upload decent chunks of data all the month with the cumulative rate reaching over 1.5 TB+ and my current ISP provides over a seamless 150-200 Mbps speed which isn't truly achievable with the VPN providers. Each time I should be logging off and on the VPN which had become cumbersome over time.
Apart from this I was initially using TOR for connecting bitcointalk in 2018 and connecting through TOR was problematic with the captcha issues prevailing back then. However theymos came up with the captcha bypass solution but I am certainly used to this normal logging behavior. When there does seem to be good exposure towards bitcoin from my country citizens I might be thinking of a way to use bitcointalk through TOR or by using VPN.