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For most, the security route of investing isnt possible due to the regulatory restrictions meaning most will have to accredited or sophisticated to invest. The MBTU utility token is for this who cant get involved in the security offering. I very much doubt they will be in a position in which they can buy MBTX. So I feel this is a closed question really and a real life problem I dont think well encounter
I can totally understand your reason for introducing MBTU and it also makes sense to me. But I still find it weird that you decided to mint new MBTX tokens whenever someone comes and offers his MBTU for it. Aren't there the same restrictions as in the STO when buying these tokens after the sale on your website for MBTU? If there are the same restrictions, I guess it doesn't make sense to have this offer in the first place because you "doubt they will be in a position in which they can buy MBTX".