I'm torn - I oppose pro, but I want to support the site. Answered
1) I'm quite opposed to two significant changes introduced with the "pro" account (see https://www.instructables.com/community/Pro-Instructables-Accounts/ for my perspective)
2) I want to support the site and the people behind it
While the above two aren't necessarily orthogonal to each other, I have to recognize that this is a business, and they are making this change purely for business reasons.
Therefore I know that if I choose to go 'pro' that may lessen the impact of my argument because, as a business, they have to recognize that even their detractors are still paying up. They may choose, for purposes of profit and revenue, to leave the major problems unchanged because it's working.
Note that I don't actually use the site enough to make the cost worth it - I'd be paying for it merely because I want to support the site and keep it going (preferably in the right direction).
What are your thoughts on this issue?