For personal account are several options to share, connect and even create a pack. The most businesses are not operating alone: a financial holding and one or more operating companies are very common.
The other thing: when I just had become member of BUNQ the pricelist was a price per (received) payment. Very quick after the introduction BUNQ changed the pricemodel for personal accounts. The old pricemodel (e.g. € 0,10 per ideal-transaction) for business accounts is still there.
So my idea: give also business-accounts the option to pay a pre-defined amount of money (also: I think businesses don't like variabel costs)