Just to let everyone know; a section of the desert from the warp to the netherrack border is now protected as a preservation area. Everyone can still collect past the netherrack, however, and I will still be repairing sand from time to time for it.
The desert warp now features a donation box for any players willing to donate spare sand / sandstone to go towards the rebuilding project. You'll find it just outside the warp station, across from RedCard's sand chest-shop.
For those players who are now using it again to collect sand and sandstone; please make sure you only dig up one layer at a time, and not making a huge hole in one spot. I'm happy to help everyone out, but I hope my work will last at the same time.
I use tp a fair bit, especially when working with someone. You just ask them if you are free to tp to them for a while, and can tp around, building/harvesting etc in different areas, instead of having to pause and /tpa every time.
That depends who you are TPing to. For example randoms = no. However many players have lots of friends. So sending /tpa requests to them all of the time gets annoying. Therefore /tp works for those people.