I flew planes with rubber bands for 15 or 20 years. They work just fine. But then I started building scale models, so I use bolts now. Bolt on wings look better. Its mostly a cosmetic thing. I generally used about 12 to 14 bands when I flew. Wipe them off good when you take them off and you can re-use them several times.

Some guys use a tupperware container 1/2 full corn starch to store the old bands. They say it absorbs the oil. At least I think they said corn starch.

One thing about rubber band mounted wings: the wing might sit slightly different in the saddle from one flying session to the next. This can make the trims change a click or two. And on low wing airpalnes, with the landing gear attached to the wing, the wing will shift very slightly throughout the day as you do many landings. Just a little. You won't have any of these issues with a bolt on wings. But bolt on wings require more work when you initially build the models.

If you expect the wing to pop off during a crash, with rubber bands, then you need to run the bands parallel to the fuselage. If you criss cross them , they won't pop off. I generally criss crossed mine for a more secure hold. You can parallel all but the last 2 bands, then criss cross them. They will secure the others , but may offer a better chance of the wing releasing in a crash.