Market Pricing: Because they are a premium broker, their pricing follows the global market trends. As IPv4 scarcity increases, the cost to buy remains high (though leasing is a more affordable alternative).
Strict Use Case Requirements: Because they want to keep their IP blocks clean, they may vet your "intended use" strictly. If you plan to use IPs for high-risk activities, you may face more scrutiny.
Size Minimums: While they handle /24 blocks (256 IPs), they primarily cater to enterprise and ISP clients, so very small-scale individual users might find the process more corporate than needed.