Once you start introducing "weight" towards past missed sponsors, as the years pass, the system will favour one group of people over others, to the point that first time applicants will have no chance of getting selected. They will have to wait years of submitting so they get seniority to get selected. That defeats the purpose of the lottery and principle of equal fairness and chance.
The 'weighting' can be in the form of additional entries to the draw, capped to max 5 maybe, one additional entry for each valid sponsorship attempt or something like that. If they don't introduce these measure I think we'll see a lot of 'unlucky' people who've been waiting years on. This 'weighting' option introduces a certain 'fairness' imo to those who haven't been selected.