As well as labour costs, here's a few more things that will effect price:
1. Currency Exchange rates
2. Import/Export taxes
3. Margins
4. Cost of materials
5. Volumes
The quality of the Ti Salsa is superb and easily compares to the Lum. The Salsa appears to be quite difficult to manufacture. The tolerances are tiny and things like the intergral compression lock, detent and cobra hood look especially tricky. A brilliant job by Spyderco in design and manufacture.