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The chances of finding the particle under controlled laboratory (LHC) conditions is predicted by theory. If the particles are not found, then the theory will require revision, and will then be subject to scrutiny under the principles of self-consistency. Progress in science is certain.
There may be other ways of looking for the particles in the real system (aka: the universe). The same criteria would apply to this approach. Progress in science is less certain.
The laboratory exercise is probably way less expensive, when compared with exploring the universe, and leads to less arguable results, because it is a controlled environment, and the results should be able to be replicated. It has cost efficiency in its favour, and a less arguable outcome.
Not looking at all, is likely to lead to non-discovery, and an ever increasing research costs (from a non-naive perspective of the funded research 'business'). No progress in science is certain.
Cheers
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