They can, but that would put debt on the balance sheet and more expenses and more cash payouts for the interest that has to be paid.
They can issue Preferred,But if convertible would be dilution since earnings reflect diluted earnings (takes into account the Preferred will be converted). Also, Preferred carries a div. rate which will also create a charge against surplus whether paid or accrued and create additional cash outflow for the dividend if paid.
The only way issuing debt,stock (common/Pfd.) is when the monies raised acquires a company whereas that companies operations will exceed the expenses and dilution resulting from the new issues.
One other note, if they issue bonds, the interest expense will offset the interest income from their lending program. Isn't worth it.