I don't understand what you mean but Labour and Tories having an interest in talking up Ukip. The votes Ukip took off them pose a direct threat to their electoral chances (esp Tories) and have helped to underline the Ed's-a-loser narrative so beloved of the media.
edit: Oh hang on, you mean to motivate their supporters to the polls? They'd rather this were a problem that just went away.
Sky News crunched the numbers of the local elections to see what it might mean for Westminster election. Even with this supposed "earthquake" and the Euro elections to draw their support to the polls, it still meant just one seat in 2015 – Castle Point in Essex.Domestically, they don't control a single council and don't have a single MP in the Commons.
The worrying part is that the notion of a 4-party system is now so well established they'll continue to get way more airtime than their likely Westminster vote share merits.