While I can appreciate the value of a good expensive tent, nothing worse than having a varmint knaw his way into the tent and destroy it. Or some drunk jackass that stumbles on your tent and screws it up. Seen both happen a few times. I've seriously considered purchasing some very lightweight backpacking 3 man tents, like the MSR's, and some of the other big names, but imho, all tents are just too easy to destroy.
If you look closely, you can find pretty decent tents very inexpensively. Just in the past couple of months, I got a Eureka Teregon 8 a 4 man tent that's 8.5' x 7.6' with 5' center height for $60 brand new. Breaks down to 8.6 lbs, and rolls up plenty small.
I got a Coleman Hooligan 3, a 3 man tent that's a little smaller at 8 x 7 but it has a nice vestible for dirty boots and stuff. Got that on Amazon or something a month or so ago for $55. I also got the larger Hooilgan 4, that's 9 x 7 again with a vestible online for around $60.
All of them easily fit on the bike and are decent enough to do the job, keep me dry, and well ventilated as necessary, and if something destroys one, or it gets too muddy, I toss it in the garbage without batting an eye. However, if it was a $400 tent, I'd be spitting blood.
I did however splurge on those items that are a little more durable or protected, like a great Exped Synmat 9 air mattress that packs down to the size of a soda can and has a built-in pump - I love this thing! Also, a nice down sleeping bag that is rated for 40 degrees but also packs ultra small - Can't recall the name, but another good investment. MSR mini stove, a mini propane lantern, and those items that aren't at risk of being torn apart by nature, and I can keep in the tourpack to avoid theft. That's where to spend the dough on.
My .02 fwiw.