I've got dental implants. What happens if I don't put crowns on them?

Implants are place for a reason, and the time to put the crowns up are untill 5 months. If you dont put the crown you migh be lose bone and it coul be worst. I recommended you if you dont have enought money look for another place or country were you can found it cheapper. For example in Dominican republic dental crowns are around $480.00 US. I hope it help.Good luck!

Be careful not to wait too long.  The adjacent teeth may shift into the space creating other long term dental problems.

Nothing major will happen if you wait a few months or a year to two. The cover screws may fall off in which case you might need to have your gums trimmed again to have the screws replaced back on the implant. Also, teeth may shift and over-erupt around the implants which might necessitate orthodontic tooth movement if you wait too long. But if you only wait a short period of time, in my experience, you should not have any difficulty 

in such case issue is not with implant but issue is with opposite teeth, it will supra erupt . and when u will plan for implant prosthesis . it might possible that u will not get proper space for implant prosthesis.about cost, if u want to save money go for dental tourism, it will save upto 70% on yr total treatment costing.

There is no real downside, except changes in the bite.  Nothing will happen to the implants, but the teeth around them will start to shift.  I would put a removable replacement in, like a flipper or retainer to keep the teeth around in place and save up for the crowns.  No harm done.