But anyway - who will invent new things?
Who will innovate existing?
If they will not get any benefits for their hard work - why bother?
If they will get benefits - then sooner or later - everyone will not be equal anymore.

I think that USSR was lagging behind the West partially because its inventors/scientists/etc. did not get fair compensation for their work.
For example Mikhail Kalashnikov - his invention is produced in massive quantities - yet - he does not have any benefit from that.