1) See elsewhere on this page where we explained that most companies are unwilling to add new payment types to accommodate individual vendors. This is as true for Bitcoin as it is for Paypal. It is probably more true, actually, since Paypal is a known-to-be-legal regulated subsidiary of a US Fortune 500 company and Bitcoin is Bitcoin.
2) Suppose you issue a US company an invoice for $10,000 and say "You can settle this invoice in Bitcoin." How are they actually supposed to do that? My impression is that the best option currently is to connect their bank account to Coinbase (note: non-starter!), wait a few days for it to be connected, then purchase $10k worth of Bitcoin at market price. $10k is +/- 17 BTC, which they won't actually be allowed to purchase in a day. It will actually take four days of repeated work to buy that $10k of Bitcoin. Then they can actually transfer it to you and, yay, you now have BTC.
3) But wait! What happens if the BTC price changes over the ~7 business days it takes from the time your client starts taking action on your invoice to the time they send you your BTC? Answer: somebody pays for this risk. Volatility is an implicit tax on transactions. One of the parties is going to be short BTC and one will be long BTC for the week, and given that BTC can very easily move 20% in a week, that means that your $10k invoice might be $8k or $12k.
3a) Clients do not like when $10k invoices turn into $12k invoices because To The Moon, Yo.
4) Suppose you have +/- $10k worth of BTC. How do you solve the Last Quarter Mile problem to your own bank account and/or local currency? Your options are a) send the BTC to an unregulated exchange and accept counterparty/currency risk (then hope that getting a large wire transfer from them doesn't cause your bank to reevaluate how desirable your business is) or b) attempt to deal with LocalBitcoins sellers multiple times, which apparently combines the wonderful trust of the clandestine drug economy with the mind-altering properties of currency exchanges.
4a) Time you spend on figuring out how to turn $10k of Internet money into $10k of local currency is time you aren't spending lining up your next $10k engagement.
5) If at any point you or one of your counterparties screw up in securing any computer or trusting any member of the Bitcoin economy, your $10k vanishes into the ether.
You should neither accept nor request BTC for professional services. They're more expensive end-to-end than dealing with banks and expose you to multiple unique sources of risk. You have plenty of risk in your business already, and if your risk appetite is high, there are more lucrative forms of risk you can "buy" than transacting in BTC, such as attempting to move your consulting practice upmarket.