I get if you're not including the actual A1's, but a DIY kit should include everything someone needs to assemble the device.  That is, the PCB and stencil are great, but it should include all the SMD components as well.  A "platinum" kit or something could also be made available which includes the A1.  I'm okay with paying a bit more for all the work you put into producing the kit and sourcing the components, but I can't justify $300 for nothing but PCB's and a stencil.  Even if that's a legit cost (I don't want to accuse you of unfair pricing), it's still too much for me to drop on a "kit" that doesn't include everything I'd need to do the job.