Everyone seems to be missing something important
A Snow Leopard disc will ONLY be required if installing a brand new drive from scratch. You can STILL do a clean install from the download without burning it or copying it to USB.
When you install Lion the first time, the installer creates a recovery partition, fundamentally building the install disc into your hard drive. After that you can erase your OS partition and install Lion cleanly if you wish. Just don't erase the recovery partition.
So only the FIRST time you install will need to be an upgrade. After you have the recovery partition in there you can clean-install to your heart's content.
The only time it's not a great user experience is if you have a hard drive failure, at which point you will need help from a professional (or hobbyist) anyway, and they will know how to handle the situation. It's not a user friendly solution to install Snow Leopard, upgrade, then clean install, but a pro or hobbyist will have the skills and tools.