The main impediments to commercial exploitation of these resources are the very high cost of initial investment, the very long period required for the expected return on those investments (The Eros Project plans a 50-year development), and the fact that the venture has never been carried out before — the high-risk nature of the investment.
這些資源的商業開發的障礙，主要是初期投資的成本非常高，這些投資的預期回報需要很長時間（愛神項目計劃五十年的發展），由于是高風險的投資，該計劃一直未進行。