yes most of the time,
a friend of a friend of mine, went to south Korea for a holiday, met a girl there, stayed with her for 6months, he came back to the uk, with no job, no savings, living with his dad,, so he got his dad to sponsor her - she got a VV , stayed with them for the 6 months, went back to korea got another VV, came to the UK went back, but the 3rd time she applied she was refused - for a few reasons, her poor english, no job, no savings etc.. she was lucky the first 2 times