Such disputes can cross many borders. The WIPO ecommerce site includes considerable information and a fee schedule. If the dispute does not rise to the level of WIPO intervention, simple negotiation can often resolve a dispute. When neither party is acting in bad faith, reasonable solutions can be found if the parties are willing to calmly discuss the issues. A token payment to purchase a name is sometimes more than satisfactory.
Many registrants hold domain names with no hope of ever really developing the name commercially.
In addition, business plans change for all kinds of reasons and a domain name may not be needed after all. If you have been sued or threatened with a lawsuit, it is probably wise to consult an attorney. It would also be wise to consult an attorney if you have questions or problems in this area that need resolution. Without the threat of litigation, however, it's probably best not to look too hard for a dispute.