There is (nearly) no demand.
Liechtenstein is a country with only ~36K population.
Sometimes there are the one or the other small - but solid - sales to Liechtensteiner companies, enterpreneurs and so on, since that country is famous for their economy/infracstructure and many wealthy people are living there. Therefore you will see occasionally 3 to 4 figures sales, but that is still very rare.
By the way, some people are also saying that one day the Chinese could get some interest in that extension; due to that some people already invested a bunch in .li. Other people saying that it could be interesting for 'Long Island' end-users. But that is only speculation.
I would personally not recommend, BUT you can invest in .li; you will only have to be very patient though.
If you should have any other question about .li, just feel free to to ask me anything.