In the last few days I converted my account from shared to VPS. What I'd say is I expected it to be more expensive, but frankly I needed nitroglycerin to stop the heart attack! The default memory setting says I'll be charged $115/month! WOW. $8 a month to $115 that's some jump! Now after a minor heart attack, I backed away from VPS for mysql, and found ottodv's brilliant memory management package. Now my expectation is i'll pay something like $17 a month, but really, this process was much scarier than necessary.
How about having a VPS step with a limit of 300mb memory and a fixed charge of $15/month, with then the option of adding more? That would at least seem more manageable.
Their must be more people who have had a panic other than me?