Spikes are staked to set the flowers so that they "present" well (visually appealing presentation), as well managing long spikes which can cause potted plants to become very likely to topple, and can be hard to manage in one's growing area, handling the plant, etc.
Spikes are unlikely to break from the weight of blooms, tho longer, bloom laden spikes will bow.
Sap is normal on healthy spikes, buds.
Generally, Catt spikes don't "need" to be staked. Spikes either aren't very long, or in cases of long spikes, tend to be very upright anyway. Of course, no spikes "need" to be staked, that is done for ourselves. Right now I have quite a few orchids blooming (Cyms, Oncids, - which are often staked), all with unstaked spikes.