Eurorack modular synthesizers are considered expensive by some, but they are absolutely an investment. The cost has many factors, including research and development costs and the fact that they’re relatively low-volume items. Since Eurorack modular synthesizers and Eurorack modules aren’t made en masse, their costs tend to be higher.
A bright side to the higher investment costs of Eurorack modular synthesizers and Eurorack modules is that they tend to retain their value over longer periods of time. That means, though they have a higher upfront cost, you’d likely be able to sell them for close to what you paid for them if you decide it’s not for you or if you’re looking to upgrade or change things up.