The buyer will receive the support because you can always contact the user trough their contact form. Almost all the authors resolve these problems like that and not on the product page comments section…so there is really no problem.
With more than 75 different scripts and templates in my orders list, the percentage of authors that I got support is less than 10%. And I’m talking for scripts marked as supported. This 10% increased to 50% (again too low) when I asked support at their site. Comparing support requests in Comments section vs Email from their contact form, maybe it appears strange but Comments works better. Maybe they don’t want other visitors see there unanswered questions.
For the old days when there was no renewal and prices were lower, I found it normal. Actually when you buy something for $10 one time payment, let’s face the true, you can’t expect support. But now with higher prices and renewals, things must be change.