If you are a small manufacturer 30-day vs. 7 -day makes a lot of difference. Small business is high-end are most of the time run with very limited financial resources - I can imagine that loan interest rates will be high for an high end cottage industry and financing sources are not easy to find. These companies depend on income due to sales for the payment of next batch, and suppliers of hand manufactured products, such as special capacitors or chokes take a considerable time and minimum quantities to deliver an order.
Also, if they would have a 30 day return policy they would perhaps have to quadruple the number of stocked units - and once an unit returns it needs to be checked and re-packed, it can take a lot of time.
We should remember that after a few weeks many audiophiles loose their initial enthusiasm and start doubting about how well their money is being used. It would be nice to have real statistics of returns of comparable products. Please do not refer to Sanders for comparisons - some one accepting to listen to a single user speaker is not a typical user and their products have a special type of consumer, very different from Lampizator buyers.
In the end it all a business. Higher experimental period needs more money, implying higher margins. And bankrupt companies are of no good to the high-end. All IMHO, surely.