Why don't you guys use VASP?

And why don't we all drive a pick-up truck? Different tools for different needs. VASP is a very good code for some calculations but it lacks the stability and flexibility needed to calculate other systems. RSPt uses a very flexible full-potential LMTO basis set which can give very good results for d- and f-electron systems, also under pressure, where pseudo potentials and plane waves are very difficult to use. The basis set is often very small and the calculations are therefore most of the time very fast.