As volunteer guides operate ever more closely to areas worked by professional guides, they may encroach on their areas of operation and there is concern that the volunteer or low-fee sector will impede the fee-charging market.
「本職」の領域に近づけば近づくほど、本職の本分を侵すことになり、「無償」ないし「低額」が正当な市場形成を阻害することになりかねないという心配がある。