Expensive is relative. If compared to Excel; it's expensive. If compared Profix, Adaptive Planning, Budget Maestro, or Solver, not so much.
That said, all of the aforementioned products have much bigger install bases and much bigger R&D budgets. Hard to go wrong with Adaptive. Solver is a 90 Minds member and a good option as well, especially if you are looking for a reporting alternative to Sage Insights.