I cannot answer for enom, but let me guess. eNom is successful in reseller base, they must do everything to protect their resellers ($29.95 retail price vs $6.95 resell price) and some (or many) of their reseller might be doing web hosting, they don't want to create conflict with their reseller business and the cost would be lost many of those reseller customer and final revenue might go down instead of up!
Beside, they have already offer free 10 web page (with much restriction, but it is *FREE*)