Jammers are more expensive electronic equipment

[Perfect Jammer]

Although the Growler will now be the inaugural platform to carry the NGJ, the new jammer had originally been envisioned for integration with the F-35 Lighting II, but the concept proved to be more costly and difficult to achieve than had first been anticipated. Never-the-less, it remains highly likely that the idea will be revisited once the NGL comes into service and further work done to enable it to be carried internally by F-35 variants, as well as developing the system to be fitted as a modular unit to other aircraft types.

https://www.perfectjammer.com/gps-blockers-jammers.html

Under the partnership, Perfectjammer will incorporate a counterdrone module containing its RadarZero portable drone detection radar, RfOne, RF direction finder drone detector and possibly its Perfectjammer counter-drone jammer into the next version of the Rapid Scout HQ.Drone jammer gun Pro is a rifle shaped mobile jamming device that uses electromagnetic signals to either force a drone to land or return to its point of origin.

https://www.perfectjammer.com/wireless-wifi-bluetooth-jammers.html

This explanation is a bit superficial, and intended for simplifying things. However, if we try to “dig” deeper in to this issue, more parameters may enter the comparison between the signal levels of the two “links”.One example is the SNR (Signal to Noise Ratio) that the receiver “sees”at its input. Sometimes the jamming signal arriving at the receiver input, can be lower than the communication (“partner’s”) signal and still prevail. This is happening because usually the receiver needs a certain “margin” between the two signals at its input, in order to be able to interpret one of them (usually the stronger one). However, in advanced communication systems, this “margin” can sometimes be even negative (meaning that the communication signal can be much lower than the jamming signal), and the receiver will still be able to interpret the “partner’s” signal, making jamming a much harder task.

https://www.perfectjammer.com/drone-signal-jammers.html

Bluetooth signal can also be used to remote detonate a Bomb. But the range is comparatively less of a bluetooth signal as compared to radio, so it doesn't seem necessary to block that. Also if bluetooth is used to bomb a target, the bomber should be close buy to remote detonate the bomb and he will also be harmed in process. So it is next to a suicide mission, no use blocking by jammers.

https://www.perfectjammer.com/all-cell-phone-jammers-blockers.html

Plus Bluetooth is used in every mobile phone coming into that area for various purposes like you said Music for an instance or data sharing, so Jamming that would hinder daily activities also.North Korea is apparently active jamming GPS signals using truck-mounted systems that overrun signals coming from tracking satellites. South Korea is unable to pinpoint the locations of these jammers because the Army runs them for about ten minutes at a time and then moves them.

http://recampus.ning.com/profiles/blogs/jammers-can-bring-good-order

https://poemreader.ning.com/members/jammers