Right…no room for extra wheels. The EVOC Pro bag (which I have) doesn’t need an extra accessory.
I paid the extra freight for the luggage fee – which was $150 each way. But I rode for 4 days on my trip and it would have cost at least $100 a day to rent a decent bike, if not more. So in this respect, I saved money. Plus, I had my own bike and it fit me perfect and was a much better riding experience all around.
As an FYI – I have only traveled with my mountain bike thus far (BMC Agonist 02) – I haven’t traveled with my road bike. But the PRO bag does come with the road fork adapter(s).
Traveling and biking is pricey – there’s almost no way around it, unless you want to totally deconstruct your bike (which I don’t) and I didn’t want to buy 2 bags – one for each kind of bike.
Overall, I’m happy with my solution and don’t feel like I was price gouged. To be honest, the biggest annoyance (and only a minor one) was waiting for the bag to come out in the oversized section.
But…also…I got to ride in this place (see below) with my own bike which was totally dialed in and perfect for the terrain I was flowing 
– totally worth it
