I'm with you on this one. I value my ability to develop applications for my Android device free from worry about a future update taking that ability away from me. My applications never need to be on an app store, and I can share them with whomever I like, in any manner I like.
Why would I buy into an ecosystem that then forces me to hope someone far smarter than I is able to break the security of that system for me? Jailbreaks are worrisome because they introduce a potential loss of security on mine, and all users phones.