Mark's words come to mind. Resources. Wisconsin lacks resources. When Khalil was interviewed, he stated he had 4 people working full time in Madison with recruiting. At Michigan State, he has 12. It's obvious that you can cover at least 3 times as much ground with 12 than you can with 4. It also means there are less follow ups with 4. It also indicates that their budget is bare bones, not geared to go out and do top level recruiting.
As for the number of offers, that's pretty much dependent on the number of real contacts they can make, and how many people they have who are able to stay on top of the situation regarding potential recruits. Wisconsin is not projecting themselves into recruiting like they should. They seem to be laid back, and think that the best will just decide that being a Badger is all that these kids have ever dreamed about.