Not anymore. Once upon a time the costs of training in, then buying the materials seemed prohibitive. The internet, centralised testing centres and the number of trained consultants available to run sessions means even the smallest company can get the benefits.
There’s a strong argument that smaller companies need to use the technique even more than larger ones. A rogue senior manager in a 30,000 staff company can do damage; in an SME with 10 employees he or she can literally destroy the business. Every recruitment decision in a small business is high stakes!