We offer many products for Witnesses but have non-Witness customers as well (especially for our briefcases). Granted, the bulk of our customers are indeed Jehovah's Witnesses. We even regularly get orders from bethelites, Circuit Overseers, and District Overseers.
Regarding the question about using spiritual contacts for business purposes, we have a very strict policy to never actively market to the brothers anywhere. We do not ever sell anything at the Kingdom Halls. People only find out about us because they have found our products online. Likely that is how you, dear reader, also found us. Our help sections also advise our customers against soliciting orders at the Kingdom Hall and other congregation gatherings. The local branch of Jehovah's Witnesses is indeed aware of our business and has not made any objections to it.
Interestingly, although Ministry Ideaz is relatively new, our business is certainly not unprecedented. The following companies also specialize in products for Jehovah's Witnesses. Some have been in business for several decades:
If you were to Google "Ministry Supplies for Jehovah's Witnesses" you would find several more.