In the B2B world, at least in Europe, businesses don't count the VAT in what they pay. It is common sense that a price is displayed "+VAT" or other tax names for other countries (TVA in France, IVA in Spain etc...).
Not having the possibility of showing the pricing without VAT means a visitor will think you are basically 20-21% more expensive than what you actually are. It is a massive business-block.
To sum it up:
If my business sells something for 100€ to another business, the final price their credit card is gonna pay is 100+Tax (say 20%) = 100+20 =120€.
But they only care about the 100€ pricing as company don't pay these taxes in the end (they get them back from the state afterwards basically).
before getting this logic it would be more important to get the Tax calculation right.