Both cost the appraiser a considerable amount of money, thus making them marginal solutions.
Nationwide advertising is expensive and it is difficult to track national results.
As an alternative solution, an appraiser would have to rely on work from local brokers, or nationwide business referred from AMC's for fees lower than they would typically charge. Direct communication with the client, which in turn leads to fewer errors and increased client satisfaction. More work with less pressure. Access to valuable industry information 24 hours per day. Run your business YOUR way.