if you go with carpet or astro-turf and wood jumps... that is way easier and less headaches. plus cleaner too. clay is alot of constant maintenance and it is dirty. everywhere, floors, bathrooms, carpets, dust all over the merchandise.
if you get your clay/dirt mixture wrong.. costly and upsetting. too hard and abrasive, you will be eating up tiers in a night, on the other hamd, to tacky and high grip.. you wont be selling any.