A second hand home built aircraft in the VLA class, low hours with a state of the art avionic fit is likely to cost around 55k. Assuming 100 hours a year you will save around 10k per year on running costs. The business case is not very hard.
Be careful of terminology. The vast majority of SC in the UK were cleared via CS-VLA through the LAA. Factory aircraft with an EASA permit are now arriving, and ELA1 may come in 2 years. LSA is an American standard with some very big disadvantages over CS-VLA (eg no VP props, speed limits etc). The SC was designed to the US LSA standard, but most of the competition was originally designed to CS-VLA. The Rotax machine in this class with the most sales is the Europa (in the UK).
Rod1