Obviously; one payment for unlimited updates offers are not for everyone. In some cases it's a very bad decision, this goes for both the seller and the buyer.

When I priced my first WordPress product I didn't know what to do, so I just picked a number!

Seriously; I just picked $67 with no legit reason! And it was selling "very good", mostly for its value.

I don't believe in competitive pricing, I will try hard to make my product/service the best and provide the max level of support I can. I prefer to value my work, charge what I think I deserve and work with less number of clients to maintain that high level of support.

I think that no one has to offer unlimited updated unless they get at least 2 years of support cost upfront, means I will set my price, then add to that two years of support cost, and every one should be happy.