"Restocking fee" done on a % of sales price does not make sense to me. It cost the same to re-stock a similar sized amp for example whether it costs $500 or $50000.
The reasonable approach is to have the customer cover the actual or reasonable cost of shipping and handling for an in home eval. Also with an agreement that equipment must be returned in condition clearly identified by the seller up front. That way, expenses incurred are absorbed fairly if all is done as it should be. It's not much different from returning an item to a store, except now there are specific shipping and handing charges that must be addressed.
The reasonable approach is to have the customer cover the actual or reasonable cost of shipping and handling for an in home eval. Also with an agreement that equipment must be returned in condition clearly identified by the seller up front. That way, expenses incurred are absorbed fairly if all is done as it should be. It's not much different from returning an item to a store, except now there are specific shipping and handing charges that must be addressed.