Company xyz has one website (with 15000 customers) and offers a single plan for $99 per year billed annually.

xyz also has another site where they have three plans priced at $20, $40 and $60. (monthly)There is very little difference in any of the plans, just a bit more disk space and transfer.

Do most charge more when targeting their local market than the online market?

What I've found is that a lot of local customers are willing to pay more. Doesn't mean you should charge more, but I think you have a better chance of getting more in a local market than an online market.