I was actually thinking that you could make more at $10 a month. I mean, this is $120 a year for the right to make 2-3 calls a month. How many calls would the average customer make in a month? Zero. You'd have to run the numbers and maybe do a little pilot to figure out whether the psychology works out.
I think it pretty unlikely that someone would actually make use of their 2 calls a month every month.
Also, the reason I suggested the L3.5 plan at $29.95 a month is that it would upsell lots of L1 plans. So that would be a net upsell of $20 a month for a service that most people wouldn't have to take advantage of - it would be there "just in case" for "peace of mind".
Another idea would be to offer a rebate in months where you didn't take advantage of the feature at all. So it would be something like $34.95 a month for a L3.5 plan, but if you didn't take advantage of the emergency support callback, you'd be rebated $7.50 in that month. This would encourage people to not take advantage of the service - kind of like a perfect attendance award.
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