It's a niche market because you will be competing against mass produced particle board i.e (sawdust and glue) structures. Mass production vs custom craftsmanship. The kind of people that understand value vs cost are who your appealing too and not your typical "Petco" customer who may not be in it for the long haul. I build custom and commercial tanks over 500g for people and ran into the same situation when I first started my shop. You have to market to a different type of customer and remain cognizant of the price in relation to your competition. I use hardwoods such as mahogany, walnut or cherry to trim the tanks I build, my Father is a cabinet maker and custom furniture maker and we have very little over head. The stands are powder coated welded square steel faced with hardwood cabinetry. This kind of quality tends to attract a value conscious quality centric customer. What's most interesting is that when I quote a price to build a better quality tank with better and thicker materials it always costs less than the big guys with thier own TV shows.