I bought my JV3 in Aug of 2005. I've kept it under service contract until this past August. One reason I decided not to buy another years worth of a service contract was because I just had a service call late last year, like a month before the contract renewal date. Because I'm in Hawaii, I had to pay a lot just to have a technician come out, but I had sent some test prints, & it was confirmed that I was due for some new heads (for only the second time in 4 years) ...anyway, based on the high cost of flying out a technician, & the fact that multiple heads were showing substandard results, I had every head, damper & pump replaced... so of course I felt that spending a lot of a service contract right then would not be smart.
Anyway, this background all leads up to 2 things I wanted to say to your question.
When I asked my vendor if there would be a penalty for me to renew the service contract in Fall of 2010, after not insuring it for this past year, he said that would have been typical anyway, but even if i had bought the service this year, this August my printer will be 5 years old, and they will no longer sell a service contract on that age of printer... so, if you are the sort that finds this type of contract to be a reassuring investment, then be forewarned about checking the printers age against the availability of service contracts...
secondly, I wanted to tell you that I paid far more 5 years ago, then a lot of people would pay today for their printer... BUT, I feel that it is in immaculate condition & although I imagine a lot of 5 year old Mimaki's sell for under $10K... there is NO WAY I would ever let mine go for under even $15K when it works this good...
so, service contracts aside, I think a 5 year old printer from a guy who maintained it extremely well.. that could be a good thing!